Redgate
[人名] 雷德盖特
🗣️ 情景例句
Thanks, Dad.
谢谢你 ，爸爸。
What is happening down there?
下面发生什么事情？
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。